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z80dma: Added enable/disable irq, force ready and reinitialize status byte commands

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This commit is contained in:
Angelo Salese 2009-09-16 22:03:03 +00:00
parent 3c7799d14d
commit 024832f299
1 changed files with 32 additions and 6 deletions
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38
src/emu/machine/z80dma.c
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@ -108,6 +108,7 @@ struct _z80dma_t
UINT16 count;
UINT8 rdy;
UINT8 irq_en;
UINT8 is_read;
UINT8 cur_cycle;
@ -151,7 +152,12 @@ static void z80dma_do_read(const device_config *device)
cntx->addressB += PORTB_STEP(cntx);
}
break;
case TM_SEARCH:
fatalerror("z80dma_do_operation: unhandled search mode!\n");
break;
case TM_SEARCH_TRANSFER:
fatalerror("z80dma_do_operation: unhandled search & transfer mode !\n");
break;
default:
fatalerror("z80dma_do_operation: invalid mode %d!\n", mode);
break;
@ -191,6 +197,14 @@ static int z80dma_do_write(const device_config *device)
done = (cntx->count == 0xFFFF);
break;
case TM_SEARCH:
fatalerror("z80dma_do_operation: unhandled search mode!\n");
break;
case TM_SEARCH_TRANSFER:
fatalerror("z80dma_do_operation: unhandled search & transfer mode !\n");
break;
default:
fatalerror("z80dma_do_operation: invalid mode %d!\n", mode);
break;
@ -340,11 +354,7 @@ WRITE8_DEVICE_HANDLER( z80dma_w )
WR6(cntx) = data;
switch (data)
{
case 0x88: /* Reinitialize status byte */
case 0xA3: /* Reset and disable interrupts */
case 0xAB: /* Enable interrupts */
case 0xAF: /* Disable interrupts */
case 0xB3: /* Force ready */
case 0xB7: /* Enable after rti */
case 0xBF: /* Read status byte */
fatalerror("Unimplemented WR6 command %02x", data);
@ -366,6 +376,7 @@ WRITE8_DEVICE_HANDLER( z80dma_w )
cntx->addressA = PORTA_ADDRESS(cntx);
cntx->addressB = PORTB_ADDRESS(cntx);
cntx->count = BLOCKLEN(cntx);
cntx->status &= ~0x30;
LOG(("Load A: %x B: %x N: %x\n", cntx->addressA, cntx->addressB, cntx->count));
break;
case 0x83: /* Disable dma */
@ -382,7 +393,8 @@ WRITE8_DEVICE_HANDLER( z80dma_w )
case 0xD3: /* Continue */
cntx->count = 0;
cntx->dma_enabled = 1;
//FIXME: "mach" & "endb" flags should be zeroed here
//"match not found" & "end of block" status flags zeroed here
cntx->status &= ~0x30;
break;
case 0xc7: /* Reset Port A Timing */
PORTA_TIMING(cntx) = 0;
@ -390,6 +402,19 @@ WRITE8_DEVICE_HANDLER( z80dma_w )
case 0xcb: /* Reset Port B Timing */
PORTB_TIMING(cntx) = 0;
break;
case 0xB3: /* Force ready */
cntx->rdy = (WR5(cntx) & 0x8)>>3;
break;
case 0xAB: /* Enable interrupts */
cntx->irq_en = 1;
break;
case 0xAF: /* Disable interrupts */
cntx->irq_en = 0;
break;
case 0x8B: /* Reinitialize status byte */
/* FIXME: docs says these two is 1, but behaviour makes me think it's a 0, investigate */
cntx->status &= ~0x30;
break;
default:
fatalerror("Unknown WR6 command %02x", data);
}
@ -508,6 +533,7 @@ static DEVICE_RESET( z80dma )
z80dma->num_follow = 0;
z80dma->dma_enabled = 0;
z80dma->read_num_follow = z80dma->read_cur_follow = 0;
z80dma->irq_en = 0;
z80dma_update_status(device);
}